Locomotive or traction engine.



No. 649,109. Patented May 8, I900.

W. R. RENSHAW.

LDCOMOTIVE OR'TRAGTION ENGINE.

(No Model.)

(Application filed Feb. 15, 1.900.)

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UNITED STATES PATENT OFFICE.

WILLIAM ROBERT RENSHAYV, LONDON, ENGLAND.

LOCOMOTIVE OR TRACTION ENGINE.

SPECIFICATION forming part of Letters Patent No. 649,109, dated May 8,1900.

Application filed February 15, 1900. Serial No. 5,302. (No model.)

To all whom it may concern.-

Be it known that I,WILLIAM ROBERT REN- SHAW, engineer, a subject of theQueen of Great Britain, residing at No. 47 Victoria street, Westminster,London, in the connty of Middlesex, England, have invented certain newand useful Improvements in Locomotive or Traction Engines, of which thefollowing is a specification.

The invention particularly relates to compound engines; and my object isto obtain greater capacity and more equal strain. For this purpose thelow-pressure cylinders are arranged one behind the other, overlappingbut not in line with each other, and each highpressure cylinderisarranged tandem with one of the low-pressure'cylinders and alongside ofthe other, the piston ofeach high-pressure cylinder being preferablyconnected directly to the piston-rod of the low-pressure cylinder inline with which it is arranged.

In the drawings, Figures 1 and 2 show longitudinal sections at rightangles to each other of a four-cylinder compound engine. Fig. 3 shows alocal section, to a larger scale, on the line 4 4 of Fig. 1, showing thestuffing-box; and Fig. 4 is an end view of the same.

I prefer to arrange the high and low pressure cylinders of each enginetandem, the highpressure cylinder of one engine being alongside thelow-pressure cylinder of the other.

a, and b are the low-pressure cylinders, a and 1) their pistons, and aand b the pistonrods. 0 and d are the high-pressure cylinders. I castthe four cylinders together, by preference, forming an intermediatereceiver 6 around them, the exhaust from the highpressure cylindersopening direct into this receiver, which also forms a steam-jacket. Itwill be observed that the pistons of the highpressure cylinders are eachconnected directly with the piston-rod of the low-pressure cylinder inline with it. It will also be observed that one of the high-pressurecylinders is ar ranged on one side of one ofthe low-pressure cylindersand the other high-pressure cylinder is arranged on the opposite side ofthe other low-pressure cylinder. This gives a compact arrangement whichis Very desirable.

Figs. 3 and 4 show an arrangement for screwing down the covers f of thestuffingboxes between the high and low pressure cylinders. The cover fscrews into the box f as shown, and has a worm-wheel formed around it,gearing with a worm g, the spindle g of which projects to the outside ofthe cylinders.

I claim as my invention- 1. The combination of two low-pressurecylinders arranged one behind the other, overlapping but not in linewith each other, and two high-pressure cylinders, one of which isarranged on one side of one low-pressure cylinder, and the other ofwhich is arranged on the opposite side of the other low-pressurecylinder.

2. The combination of two high-pressure and two low-pressure cylinders,the low-pressure cylinders being arranged one behind the other,overlapping but not in line with each other, and each high-pressurecylinder being arranged tandem with one of the low-pressure cylinders,and alongside the other.

3. The combination of two high-pressure and two low-pressure cylinders,with their pistons and piston-rods, the low-pressure cylinders beingarranged one behind the other, overlapping but not in line with eachother, and each high-pressure cylinder being arranged tandem with one ofthe low-pressure cylinders, and having its piston directly connected tothe piston-rod of the low-pressure cylinder in line with it.

WILLIAM ROBERT RENSHAIV.

Witnesses:

WILFRED CARPMAEL, HERBERT ARTHUR MARSHALL.

